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**Abstract**  A novel, Gram-negative, non-spore-forming, pleomorphic yellow-orange bacterial strain was isolated from a stadium seat. Strain Coronado(T) CoronadoT  falls within the _Erythrobacteraceae_ family and the genus _Porphyrobacter_  based on 16S rRNA phylogenetic analysis, but is both phylogenetically and physiologically distinct from existing genera in the family. A phylogenetic tree inferred from 16S rRNA gene sequences shows a highly supported clade containing Coronado(T), _Porphyrobacter_, _Erythromicrobium_, and _Erythrobacter_. While this analysis. This  strain has Q-10 as the predominant respiratory lipoquinone, as do other members of the family, the family. The  fatty acid profile of this strain is distinct. Coronado(T) similar to other Porphyrobacter, however CoronadoT  contains predominatly predominately  C18:1ω7cis and C16:0, a high percentage of the latter not being observed in any other _Erythrobacteraceae_. This strain is catalase-positive and oxidase-negative,the latter of which is unusual for the other genera present in the same family. Coronado(T)  can grow from 4-28°C, at NaCl concentrations 0.1-1.5%, and at pH 6.0-8.0. On the basis of phenotypic and phylogenetic data presented in this study, strain Coronado(T) CoronadoT  represents a novel species ina new genus in  the family _Erythrobacteraceae_ Porphyrobacter genus  for which the name _Kirrobacter _Porphyrobacter  mercurialis_gen. nov.,  sp. nov. is proposed; the type strain is Coronado(T) CoronadoT  (=DSMZ 29971, =LMG 28700).